Development of a Hot-Gas-Cleanup System for Integrated Coal-Gasification/Molten-Carbonate Fuel-Cell Power Plants. Quarterly Report No. 2, January 1-March 31, 1983 (Cobalt Aluminate and Manganese Oxide)

摘要

Five metal oxide sorbents were selected for laboratory-scale testing of their sulfur removal characteristics, sulfur removal capacities, and elemental sulfur production capabilities for use in the high-temperature sulfur removal process. These were (1) manganous oxide, MnO; (2) cobalt aluminate, CoAl sub 2 O sub 4 ; (3) iron chromite, FeCr sub 2 O sub 4 ; (4) iron orthosilicate, Fe sub 2 SiO sub 4 ; and (5) cobalt titanate, Co sub 2 TiO sub 4 . Laboratory-scale fixed-bed reactor studies in a 1-inch OD Schedule 40 refractory-lined 316SS reactor were completed this quarter with the cobalt aluminate and manganous oxide sorbents. Both sorbents exhibited useful sulfur removal capacities. However, neither sorbent produced elemental sulfur during regeneration in the proportions expected. Two molten alkali carbonate mixtures were selected for laboratory-scale testing of their HCl removal capabilities at 1200 exp 0 F. The molten alkali mixtures chosen were a 52% lithium carbonate/48% sodium carbonate mixture and a 43% lithium carbonate/57% potassium carbonate mixture with melting points of 925 exp 0 and 910 exp 0 F, respectively. The porous ceramic selected for supporting the molten carbonate mixtures was magnesia, MgO. Several cylindrical pellets of the MgO-supported 52% lithium/48% sodium carbonate mixture were prepared and characterized this quarter. Several alkali-carbonate-containing ceramic pellets from the IGT thermal energy storage program were also secured for testing purposes. This included Na sub 2 CO sub 3 /MgO and Na sub 2 CO sub 3 /NaAlO sub 2 pellets and an NaAlO sub 2 -supported 52% lithium/48% sodium molten carbonate mixture. These pellets will be useful for comparison testing. Progress was also made this quarter in assembling the supporting equipment. (ERA citation 08:043173)